VALYRIANTOOL COBALT LEFT HAND DRILL BIT Instructions: 1. Grind or flattern the head of damaged bolt or screw. 2. Use a heavy hammer and center punch to make the centre of bolt or screw. 3. Drill into the bolt or screw in reverse using a left hand drill bit with lightweight oil. 4. Most bolts or screws come out before the hole drilling operation is finished. 5. The hole drilled will form a pilot hole for a screw extractor if the bolt or screw isn't removed out.